Frame rate limiter for Linux.
Typically you'll use these commands to build the program
make
sudo make install
Debian, Ubuntu and derivates may need some or all of these packages:
gcc-multilib
g++-multilib
libx11-dev
mesa-common-dev
OpenSUSE needs these packages:
glibc-devel-32bit
gcc
gcc-32bit
gcc-c++
gcc-c++-32bit
Cap the FPS (frames per second) of a chosen game by using the included script strangle
Example:
strangle 60 /path/to/game
Run strangle --help for full usage info
You can use this with Steam by right-clicking on a game in your library and selecting Properties and then SET LAUNCH OPTIONS... under the General tab. In the input box type:
strangle <somenumber> %command%
On laptops you can specify an alternative framerate cap when running on battery power with the STRANGLE_FPS_BATTERY env var or by using the <fps>:<battery_fps> syntax with the strangle script.
Example:
strangle 60:30 /path/to/game
Vertical sync can be controlled by setting the STRANGLE_VSYNC environment variable or with the -v or --vsync command line options. Beware that OpenGL and Vulkan work differently on the same values:
OpenGL
- -1 - Adaptive sync (unconfirmed if this actually works)
- 0 - Force off
- 1 - Force on
- n - Sync to refresh rate / n.
Vulkan
- 0 - Force off
- 1 - Mailbox mode. Vsync with uncapped framerate.
- 2 - Traditional vsync with framerate capped to refresh rate.
- 3 - Adaptive vsync with tearing at low framerates.
Examples:
strangle -v 1 /path/to/game
STRANGLE_VSYNC=2 strangle /path/to/game
STRANGLE_VSYNC=1 strangle 40 /path/to/game
Run strangle --help to see command line options.
Strangle can also be controlled with the following environment variables:
| ENV VAR | Value | Explanation |
|---|---|---|
| STRANGLE_FPS | <decimal> | Maximum framerate. 0 to disable. Any positive value to enable |
| STRANGLE_FPS_BATTERY | <decimal> | Maximum framerate when running on battery power |
| STRANGLE_VSYNC | <int> | See the above section on v-sync |
| STRANGLE_GLFINISH | 0 or 1 | Forces glFinish() to run after every frame (OpenGL only) |
| STRANGLE_PICMIP | -16 to 16 | Mip-map LoD bias. Negative values will increase texture sharpness (and aliasing). Positive values will increase texture blurriness |
| STRANGLE_AF | 1 to 16 | Anisotropic filtering level. Improves sharpness of textures viewed at an angle (Vulkan only) |
| STRANGLE_BICUBIC | 0 or 1 | Force bicubic filtering (Vulkan only) |
| STRANGLE_TRILINEAR | 0 or 1 | Force trilinear filtering (Vulkan only) |
| STRANGLE_RETRO | 0 or 1 | Disables linear texture filtering. Makes textures look blocky. (Vulkan only) |
| STRANGLE_NODLSYM | 0 or 1 | Disables the hooking of dlsym |
| STRANGLE_VKONLY | 0 or 1 | Stops strangle's OpenGL libs from loading |
| ENABLE_VK_LAYER_TORKEL104_libstrangle | 0 or 1 | Enables the implicit Vulkan layer |
| DISABLE_VK_LAYER_TORKEL104_libstrangle | 0 or 1 | Disables the implicit Vulkan layer |
vkQuake with STRANGLE_PICMIP=1337
You can adjust the mipmap lod bias in both opengl and vulkan with the environment variable STRANGLE_PICMIP. A higher value means blurrier textures. A negative value could make textures crisper.
Might crash if used together with other libs that hijack dlsym, such as Steam Overlay. It seems to work with Steam Overlay when placed at the end of LD_PRELOAD for some reason.